Hammer-drill.



w. PRELLWITZ. l HAMMER DRILL, umarmen ruin JAN;11', I190'9.

1,015,509. Pmmamzs, 191:2;

. /F/L .2. (y, .4.

I j -Applicatipnmed January 1 1, 1909. serial471,735'.Y f

To all whom it may concern: Y I Be it known that' I, WILLIAM a citizemof thezUnitedl States, and' resident.'

' UNITED STAT Es PATENT oFFicE.

WILLIAM 'rnELLwIra oF EASTON, PENNSYLVANIA, AssreNoR '.ro I NGERsoILL-RAND coMPANY,.oF NEW YORK, N. Y., AIC0RP0R ,ATI0N10F NEW JERSEY." -v

HAMMER-DRILL.

of Easton, the county #of Northampton and State oil Pen r 1sylvania,'have'l invented new and useful Improvements-in' ,Hammer+ lDrills, o fwhich the following 's'pecif cation.

This invention relates Vto; han'irniel"drills and has for itsprincipal object toprovide an .attachmentfor the drill which may bereadily brought into and out of position for use as a stop for limiting the' outward move'- ing its work.

' A further objectisto provide .an attachment of the above character which maybe usedV as a" fo'otvsupportwhen the drill isin use.'' v

.Y A lstillurtherl object is to provide certain novel features in the con'structlOXI, form and- 'arrangement of the several parts/of the at-A A tachment whereby it is rendered' particu-v` larlywell adapted to the use for which'itis intended.'

In the accompanying drawings, Figure 1 represents a hammer drill in top plan with j my attachment applied thereto, Fig. 2 'is a stop piece swung out of its steel retalningv 'posltiomand Fig. 6 is a detailv frontend view of the integralfront head and casing 'MQ-'for the stop piece shank .for showing more l spring and view of the "same, partly yin .side elevation and partly-in longitudinal central section, Fig. 3 is a front endview of the drill, the

stop piece vbeing shown in full lines in .its

position when used asastop to llimit-the ou'tward movement' of the-drill-steel when it .j is not striking its work and in dotted lines in the position which it occupies when :the drill steelis -striking its work, Fig. 4 is' a detail side View of the from end of the drill, showing the stop.l piece swung l-into 'position :to limit the outward movement of the drill -steel,Fig. 5 is a similar view showing vthe clearly the recesses'arrnged -to coact with a piecein either of its positions.

\ '\The hollow drill lsteel 5 vhandle 3 and frontlieadi.-l

PRELnwrrz,

rejections on the sha'n'kot` thev stgp'p'iece f or yieldin'gly h0ldin`g the stop'.

' shank withfa screw threadednin'ner Patented Jam-2 3, 1912;'

- vlayaie nel chuck 7. The hou'w drin 'Steel is-p'rovidedwithan abutment which, in the present instance, isxin the form cfa collar 8l which serves the double function of'limiting theinWardmOVement of the drill steel with respect "to its chuck and alsoas the means-for engaging the 'stop piece, to be hereinafter described, j for limiting ythe outward movey vment ofthe drill -steel when it is not striking its work."`'The.attachment to. the, drill for'y vllimiting-this out-ward movement of the drill steel-is constructed, arranged and operated. as follows-:-`The front head 4 'of thedrillis .provided vwit-h L a longitudinally arranged hollow casing9 -oif-se't from @the front head,

andi located at its front end. *A stop piece v isj hinged to swing into and out ofposition to" 'engage 'the shoulder von the drill steel, which stop 'piecehas a foot l0 provided with Y,

an Yopen reces'sfll'so that the toot may be,

swung into positionto partially embrace the drill steel ataxpointfbeyond the collar" 8- The shank .of this `stop 'piece is reduced to form afshoulde'r i12 engaging the front end which f orms the abutment on the drill steel.

of thecasing 9.1 The reduced portion'l of i thi's shank extends through the hollow cas-f` 'ing 9 and isprovided with an angular portion .i 14 forthe reception of' a handle v15 vj vwhichprojects laterally in the opposite vdi rection'from the 'foot 10 so thatjwhen 'the stop'- piece isswung into its position to' 'reg lease the drill steel, as when the drill is iiiside of. the drill 'and' the handle laterally upon the other side of the drill so as to form -use, the foot will projectlateralgly on-one i shank' otthestop piece by providingthe whichfis engaged by a nutl?.v j

'The stop piece is permittedl a shor'tyieldgV end .1,6

."ing'movement so thatwhenv the co11ar',8

strikes the foot 10 when the drill steel is-'not'l striking Aits work, vthe said blows., will beab-g' sorbedby the yielding stop piece and notl transmitted to the drill.k This result Iis accomplished by linterposing a coils'p'ring 1 8 between the handle 15 and a shoulder 19 in the boreof 'the' hollow casing 9. This stop piece is -yieldingly held ineither of its posi- 'tions by this same spring 18 and t-hel provi--l sion of notches 20, 21, in the vfront: end of thel hollow casing9 and a projection or projec- 6.5' 'an angular portion Garrangedto beengaged tions 2 2 on'th'einner face of the shoulder 12,

When the drill is in' operation and movement drill Steel is striking its work, the stop piece may be swung out of its poeition 'to loe engaged by the colla-r on the `drill steel. Vhen tliestop piece is thisposition, the opera.

tor may use either the foot l0 or the 'handle 'l5 as a rest for either one of his feet.

When `the operator wishes to withdraw the steel partially `from the hole, as, forinstanee,

forthe purpose oi peri'nitting the air to blow any material out of the hollow steel, he will tifrsty swing the stop Ipieeearound into vposiltion to limit the outward movement of the steel. by bringing the 'toot l0 into position to beeiigaged by the collar 8. He may then i,

withdraw AFrom` the yabovedescription, it- Will Vhe seen that this attachment is very eimpleahd complete in its construction and 'operation and that it` maybe instantly.broughtyinto and yout of position `thus.permitting the ready insertion aiidvremoval of the drill steels. f

What I claim iS:--

l. A hammer' drill, a `stop piece movaloly mounted thereon, a drill `steel having anabutmentfitted toengargeeaid Stop piece for limiting the fout'war movemento the .steel when fit, is not Striking its work, said stop )ieee beine' movableinto and out of lositionl e Y P to be engaged by thegabntment on the drill steel, and separate means for yieldingly re; taining Jthe stop piece in either ofits positions against unintentionalVremovah 2. A hammer drill, a laterally .swinging stop piece hinged thereto, a footand a handle projecting frointhe t top piece, and a drillthaving an abutment itted-to Vengage he drill, thus permitting the col- .said stop pieve Ator'limiting the outwardv ofthe steel when it is not. striking stop piece hinged to the drill, said stop piege being provided with a foot arranged to be swung into and out ofiposition to be engaged by theabutment on the drill steel, and also with a handle whereby either the Jfoot or the handle may be used as a foot rest when the stop piece is swung into a position away from the drill steel.

Il. A, hammer drill, a drill steel having an abutment, a hollow easingA on the drill and a Stop piece having its shank located within Said hollow easing, said shank being provided with a. laterally extended toot and a handle, said yfoot being arranged to be brought into and out of the'path of the abutmenty on the steel bythe sfwingingvlinove-l ment of the stop piece.` i

n 5, A hammer drill, a drill steel having an vabutmentv on the steel by the swinging movement of the stop piece, and a spring t'or permitting` a limited .longitudinal yielding movement of the stop uiece. i

'In testimony, thatclaim the foregoing vas my invention, I have signed my name in presence of two witnesses, this 0f January A. D. 1909,. g

' WILLIAM rRELLWiTZ. -witnessesz VARD'RAYivioND,

l j CHARLEs M'ILLER:y

.eighth 4day 

